Most successful sites do not need to practice SEO, but is it worth doing low risk SEO stuff? If you are not going to be agressive about it why even do SEO at all? How do you define the line between what is risky and what is not? What is SEO and what is not? In the thread Jill Whalen made it sound like marking up page structure is not SEO. What is? Research papers dating back at least to 1998 show code structure is used to help determine relevancy (Marcia added the link to the SEW thread).